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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cd6142cbd3f3c44a2f526ac4cf1d6e3d75e127e0c1c076e7c1c33195fa9c10' 
  AND token = '6lBCZcI964USfrkSz3zqVXaZgjIb9a/ycD+co/7oPhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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