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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1786546ae0559b4d65f01819f77d8c104ee122b5d780e6b16cb0c17bbc4addc' 
  AND token = 'nG9+vlMRrBrfh04DbsNax2kI9RQhT3/K/pLenQnrQl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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