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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1017ade4659d4b7ccd5e4ec864028e0b96d20988d4108b30f090de67e451186' 
  AND token = 'flRW62zSTd+lL/l26sXaOyzvqg/MhWmlQOIKC7Sl8dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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