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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931b15edb898ca1d91c0a49538a3728e5fca4ed283a1a7d58a46067031a6d56d' 
  AND token = '7CXrp7bhHJ4YZj8i8NNplRYIJkZA2lSBJKANkbK5zLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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