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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c2b3256abf6425bf26861e485132332f92a0d52df891d5f5c00573d4011343' 
  AND token = 'cfNnVKhEuyrJp6bL0Tz2w3x2iF6Z4bAO5DUI7Qe1ilg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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