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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70ee017b5d2949665089a211184d776af15ac97abb728663b7d17a5de40b6e8' 
  AND token = 'sUmo6CJaqX2EaIw/sFowipnbJEmM+bbbmZOOmO9zGHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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