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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c814fa288a70015f3012089a51e0518716cfbfdbdaf6c8348dc06e62e9af739d' 
  AND token = '8izrfxk3mQKDv8uszq34GC9QPi2++JOeUWzOyK1dNpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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