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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3b011fae7b01432b561efab9aaf0c2b17347c6ce37d6f9c820e859f6cae27c' 
  AND token = 'WJRBwHSGZf6gUtCc6Qn91o3JBElcm5I/s/WyYiEkZXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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