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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f63c23ed3e83e9f95c1663b3ffd276f7f138ea0d8d73db3e4e722510a22b3ae' 
  AND token = 'X76/TcauIk7QE5YNAavJV4UAgSiXUYvj44LU4N8LxlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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