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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2869b1b56232150887c28ac1dbf8e8c873aa5a215e3a77550a3547a881bd35b6' 
  AND token = 'oQXiHObtxqGorM+MebBrFR1OoHj9YGU4O1Hew1GPmZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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