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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d22bc8bbff26745b75f6326be8438f83a9bc6078b38d7c2eff05e298beb6dda' 
  AND token = 'iwVqcWM7yZR0QOM+bW81STf7nEhSn18uYwm9wJVQIW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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