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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57785c2313e622c41336a476c3f8499993f0b0b178f7e7984f3773fde9255994' 
  AND token = 'sOT8y64FAkF3kJz2xqC18fXVuIG6RBQSO8VR9vI3nQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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