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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f3ef510829d6c2c05d4293e785da6c8cc3e848310662daf1dea869fdf2491a' 
  AND token = 'm+aN58EB/VRY4+I132IXvt5syEsU2fRqI3cU4o0j3X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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