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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e35cabdb8db414d4ea893f31bf90c369d4ab3d6bc8631c930ac3230194e0d1f' 
  AND token = 'aDGBIjrH9xYa7WEplx2r2OfydnG+1ZWfGNkOTTBmJ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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