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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4f7617781a013e1632a683d4e9881f758029e5e83d3a0c5c64ef08b82463cc' 
  AND token = 'A4h60MVKoftuCvpJbmPbsKUHN7S+nedfy9IKdZgiY5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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