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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c1295ef60fb9fffe59018903ec59b66a193553a2b19532d6d096ae8e10ddc1' 
  AND token = 'F5kGxSWDaqtllmtlW9Lq8Tskc5qBJg/vckEljaTTud8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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