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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995eee6b782a1196892686345473b4df1c0ea2891e6256765bf8a01064b82195' 
  AND token = 'edqAxxrH7S+C+fcnHXcIYIyH2V3FT6m/y7u8wwwta+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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