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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4c438148cb113f5220f8cef26e7c3c9f6a3e1d54ba82e41a35ea6e53feeac7' 
  AND token = 'BuPOC3t+8RjHAD6S4bSlJdyrvZpJY61M+UrmyZeAy50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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