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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c590eea561e98fc9ea15b5d646cac532e5cc51af4561951151affefab0542d7c' 
  AND token = 'YVF1g1P3LwTevSkUNQqXN3wLp4aCpgmNyU7iWtgagU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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