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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9401aeed366a0085e3971a7818f2dd9d81d87bfa77ac4295fd91260c5604488f' 
  AND token = 'Im2e5Ol0ksFDAa6daJGk2VSuNd3OXtnmBaPxYIPI+2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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