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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ebb04ce969b9a188901c7cddcc5da13d5c22a4d198eac29330bac3196d001e' 
  AND token = 'bEteU4NFL6gFQEr+jng6KoWMaDMpiQWm19R611uAUqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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