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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7428062c3fbc405d3ee29ec878fef089a59eb9c0c7243eafcaf8d01e69f569bd' 
  AND token = 'AlZami1m3K+THhk8uD0Gvt264XwSxs6oLBZoDl+G6xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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