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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf952ab599125d9af13a669a989e44676be7b63c672bf1860b0c23a41d54442c' 
  AND token = '/CejQHOs/tAy8ii10V8wVfdAKuw7tAB6thTissfGsv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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