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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de66d59d30dfa161cc98edc9fc2f9e2dd58b3e7423e39349dee29af88d355bcd' 
  AND token = 'SQae+RIH8bJKfe8BrjO4kkU75V/xCzcGMqQPejF1buY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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