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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad19f96b070946ceac7188e744765d2dfa3c878c64da51f282f464b5009602ca' 
  AND token = 'N5XN2qn3ZghWNkH/dSOmbVDBCvFtqfj6lfn/A7XUgdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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