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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6aa62db34b54e16e63174ea1630eaa69a48bc8d7cbcde72746f4a118515f959' 
  AND token = '0k4lyaBs3XypPGmtqDi3PPiE2uLZxJtPe9Yp0/sORQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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