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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a981dd4625d1c2898d0f55be5223d20d10f01744a1bee5b6e3a1c4460f3f9d' 
  AND token = '1wz8Cw8/Z8hnc79s2aWhkKmNSdkrgLRATtXRY+fGHwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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