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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7292be6298034c2c8bdc96a23d35b2c6a60d7fe871c3ff4a5d8270d8d95f845e' 
  AND token = 'a3qAYybqrbeWh3gr1dPPfJyrXNrm9pCK3AAPXG5siQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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