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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f0406d8231d885a1cb56508c32a8bc6f99205cfec403181729cd96a2c47ecd' 
  AND token = '3lw6hGHY95A+v70/sLay7lZMVd7KYr8mqcrob2NyOsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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