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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4f5bf5ded403838788904a69f859bb7046a1b71d49d2821f15b03e7159e707' 
  AND token = 'KW3p3i9uP09t5Y7W4huOQeQXgb4F/peKgjtMDihAapU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}