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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6137e61ec7e324f7388a4b5c8e8c059703e53cc56786f1bf42f0bea3241aea' 
  AND token = 'qQUQAKXk7SFNk2Tvg+OWd3zJWHfF/L/kOcdzzc1aTD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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