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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a699116cabd791af55919a3ab9f2d7cd6fdd272835c8cb5f261622127102dbc9' 
  AND token = '2PITr2eYaE0lwgLRvGvH4u0Q8a0QnHalg7dN2oJXvLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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