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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375e47c71e1c9e8a2cb53a666f8671c469fbc317977bd7fab35da2b09316ea9b' 
  AND token = 'knte1KXkvaZKcRU2c7AnC6OoGgNX7cazzN9742Ds31k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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