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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e11aa59623d9def99a5e3d8684a1ce04f9023570f7b87840da77083693aa5ff' 
  AND token = 'kDAn+Ve8IFGRdzR0ZCqe3/qv0olBfGzrXtjkI+6eXlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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