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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8a330f119236804f9cdd224977f89e8982ecb01e18932ea6583fc6f20eb628' 
  AND token = 'ErsGpMZKSHZ3HFtpiq6sR9Neo2k01UzBglZk6BLETsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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