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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7903cbfdb9eac1842c29b3072d45dfdba5cffe6564226ae9d96b9ab2602dcb9c' 
  AND token = 'i2VCJufqTFo7JGDL0vT83x0IVRlzqymEWOmA9piL/ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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