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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b88cfbab60ed1b1335c466ae061174f48db4ac468fbb03597f9507c4c0b54cd' 
  AND token = 'L9QWS+5ix4VKW8Kojg+nqLJc6HBfxnlyH+WhZ+fXTBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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