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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e093b5349a5e2a06464269ff00cda4ce6d40c08232db80edb174fa9f751cb6' 
  AND token = 'VT31jVxCVvawq2YB3ftP0Oyf1k0c5cGw5zIzOrUkYC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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