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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afb795d15ed3b70d1008b80e555b3f51609ad960e6bf2cc6f28d0d15109fb87' 
  AND token = 'XJjAKMYIYc9u5xeGqjsK7iwbtGiTSy5Kz0jo5IEfg/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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