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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c79214b6ec0ddccfdee09837e89ac6bb22a8d67f33e1b06364b23c4a1d152e' 
  AND token = 'Y2gr1ogu0ghGuHtivP7xi2372JxZ60kK0+74grQaeQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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