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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17e796d3e6f05a3854f912d359fa3442f120e4e5ec230f55d4275bd18949630' 
  AND token = 'G1IA8he6MWAk/Q3k7NofawaAQs+k/mPERROjsuqbc+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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