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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48099b1174678032a2036549abd85c28121eaaf10af86d998058250891d5deb4' 
  AND token = 'bJZpDK3B0MBc3rtTDL+7mgILrNxYmip9YNCy2oMrlg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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