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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac96609e9f669a223dbf499d81806944532de4c6f39c0b38ed9c1af35a06406d' 
  AND token = 'SNi3YZKbXIbugjE22gn6/CjngrAmCdx4b9EYrPasvPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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