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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d878211c0f3df726f5b5225cec0d360bc4990ea2c55b2e9704523bd3b5993f' 
  AND token = 'dkF88s7uwWSXPiLgpMs7Mxuaq78W/Xspzq01ql+gyMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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