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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c007de0368f014412882b5a72826e8bf329886b6972804a0b5705730ff6117' 
  AND token = 'nACh/1bzHQEhrg7IxMfUSmV/dZCIKUSUh0F8t36AVEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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