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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7360d6279643010e5d6a708ace95f6bb07adc16ae650b2164ea0c3c5fa288ed2' 
  AND token = 'H5bK5BkgSXwrNE74Xdc+tQzOYkFP8Coe7HWCugca6QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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