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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b19bfd06f151e6305121f88a5e1ac443c32a9032849ca0f2ea7ea948ce5109' 
  AND token = 'rq8pl5FMi/gjQ7rZOBG5TVVMkSGCTr4OjO6fmT96vWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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