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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babae5b1da92d23b8b677cf95d6fa6a945c35beb8a053e7a1b2e8f169e0f8613' 
  AND token = 'LaR3G2iPLeH8H0DbVWbLitAE3gzk01Pake2FuC/Xdbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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