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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02cd2098b4aa681d78baaee3f04b9e4df0ac496b811c6177e6f865b56a2daaa' 
  AND token = 'RPzGG7kesmsCM8WXgnzHVJkfI1kcfhubpptheGo+jTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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