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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e7150cc7499a45415cf433a69f09dfc37b1c00d7d1a401c231fd718bc65a51' 
  AND token = 'tX99zO73vTS3NMfwMq66bCVgrnmYx9Kp9+VEnfC43OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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