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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57faceef47b703975b518d9879b8bec859c5e93f9474cfa9a99af7036e0e1946' 
  AND token = 'TobuIFfp9UBWR1xS9tHGuy2fDK+B4AQ4Iia5/zqqjE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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